Electric fields and i'm stumped on this problem

Air undergoes dielectric breakdown at a field strength of 3Mv/m.
Could you store energy in a uniform electric field in air with the same energy density as that of liquid gasoline?

The energy density stored in an E-field is;
u = (1/2)eoE^2

So set this equal to the energy density of gasoline, whatever that is , and solve for "E" . if it comes out greater then 3Mv/m then the answer is no.